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A sister slap is a slap that may be administered by an older sister to a younger sister, when said younger sister is acting a fool
Yo, my younger sister got a speeding ticket so I gave her a sister slap...across her face
by Louroo October 20, 2013
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When someone wants to slap someone but they’re too close to you so you don’t.
I want to sister slap my best friend but she’s my bestie so I can’t.
by itchyboa January 24, 2019
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